Packeno



' B. P. JOYCE PACKING RING 7. 2 9 1 0 3 w Av Original Filed. April 26. 1924 2 Sheet s-sneet 1 Rm B H I B. P. JOYCE Aug. 30, 1927.

A PACKING RING 2 Sheets-Sheet 2 Original Fned Apx-il 26. 1924 wwr r M HOMO MONO rarouowtiwr n INVENTOR flllrf y [V ATTORNE' Reissued Aug. 30, 1927.

R-EISSUED PATENT OFFICE.

BRYAN P. JOYCE, OI'DAVBNPOBT, IOWA.

PACKING 31110.

dated my 11, 1836, Seth! Io. 708,888, fled April 28, 1924. Application for retina fled m 14, 1927'. Serial No. 205313.

My invention has reference, in general terms, to packing rings, and more particularly it relates to'a U-shaped packing ring as applied to a floating or free piston in i hydro-pneumatic rccuperator mechanisms for n carriages.

Th: principal object of myinvention is to provide a facing of soft metal in a packing ring which will reduce the contact area m of the harder metal of which the packing ring is composed. The packing ring herem referred to is made of coin silver, but when the contact surface is composed entirely of this metal, the bore of the steel cylinder becomes scored. Accordingly, I provide a facing material of tin or some other soft metal, which not only polishes the steel surface with which it is in moving contact, but also offers suflicient resistance so that the coin silver of the packing ring which engages the cylinder will not score or mar the polished steel surface of the bore. It is essential that the contacting surface of the coin silver be reduced to a minimum.

Another object of my invention is to position the packing rings in a novel and unique manner to secure an increased area for the action ofa' lubricant.

To these and other ends, my invention 0 consists in the construction, arran ement and combination of parts, described ereinafter and pointed out in the claims forming a part of this specification.

One embodiment of my invention is illusas trated by way of example in the accompanying drawings in which,

ig. 1 is a longitudinal section of a floating or free piston; a fragment of the cylinder being shown; Fig. 2 is a plan view on an enlarged scale of the, packing ring; and

Fig. 3 is a sectional view on an enlarged scale of the. packing ring.

In the drawings wherein like characters 4| of reference desi ate like or similar parts, 5 indicates a cyhnder enclosing a floating piston comprising a piston head 6 and a stem 7. A follower 8 formed with an annular flange 9 embraces the terminal portion of the stem 7 and is held against rotation by means 5 of a key 10. The follower 8 is further formed with an annular shoulder 11 to seat a nut 12 threaded on the reduced terminus of the piston stem 7 and adapted to regulate the tension of a coil spring 13. y

Embracing the follower 8 and seated in the annular flange 9 is the coil spring 13, which engages a packing ring 14. The packing ring 14 embraces the piston stem 7 and is positioned between the follower 8 and the so piston head 6. It is reduced to seat a cup ring 15 which is securely held in place by a compression ring 16 and a ring nut 17, which are spaced from the cylinder 5 for a purpose which will hereinafter appear. A stop pin 18 carried by the packing ring 14 engages the compression ring 16 and prevents it from rotating within the cup ring 15.

The inner periphery of the reduced portion of the packing ring 14 is formed with 7 an annular shoulder 19 adapted to seat a packing ring 20, which may be similar in construction to the cup ring 15 and which is retained in position by a compression ring 21 and a plug 22 spaced from the piston stem 7 and engageable with the packing ring 14. When one of the cup rings 15 is substituted for the packing ring 20, it will be understood that the tin or soft meta-l hereinafter described will be on its inner shell or contact portion, that is to say, its friction surface.

The piston head 6 includes the same structure of cup ring 15, compression ring 16 and ring nut 17 as described in connection with the packing ring 14. 5

The chamber 23, formed between the piston head 6 and the packing, ring 14, contains a lubricant which is maintained under pressure, by means of the coil spring l3'acting on the packing ring 14, thereby prevent in a mixture of the fluids contained in the cy inder at either end of the, floating piston.

Anti-frictional metal rings 24, 25 and 26 are positioned respectively on the piston head 6, packing ring 14, and follower 8 for 05 an obvious purpose.

The cup rings 15, preferably composed of coin silver, have their friction surface or I dovetailed contacting portion formed with peripheral fl 27 and 28 constituting-Van annular oove for the race tion of a band 29' of tm or other soft meta The pfripheral flanges are reduced in width y cutting away a portion thereof as at 30 and 31 so that the smallest practicable area of. hardmetal will engage the polished bore of the cylinder 5.

By spacing the compression r' 16 and 21 and their retaining means 17 an 22 from the cylinder bore and the piston stem, respectlvel I attain an increased area for the action 0 the lubricant which is under pressure.

Vents 32 and 33 may be formed in the compression rings 16 and 21 to permit the influx of lubricant to the spaces between the compression rings and the packing ring to flex and press the latter against the OF I 0-: to friction surface of the cylinder or:

thus ,eflectually seal the same from the lighter fluids at either end of the floating lston.

P While in-the fore oing, there has been illustrated and descri d such combination and arrangement of elements as constitute the preferred embodiment of my invention, itis nevertheless desired to emphasize the fact that interpretation of the invention should only be conclusive when made in the li ht of the subjoined-claims.

aving thus described my invention, what I claim is-:-

1. In combination with a cylinder and a floating piston, the piston head being reduced to form an annular seat, a packin rm embracing the piston stem and forme wit annular seats on its inner and outer periphery, a cup ring disposed in each of the annular seats, reduced peripheral flanges (flormed on the contact portion ofl the :iyliner en aging on rings, a relative y wi e tin band d isposed hgtween the flanges and flush therewith, compression rings mounted within the cup rings and spaced from the sides thereof, said compression rings beingformed with vents, means for preventing rotation of the compression rings, and means spaced fromthe cylinder and piston stem for retaining the compression rings in fixed position.

2. In combination with a cylinder and a piston including a stem and a head, a packmg ring embracing the piston stem, said piston head and packing ring being formed with annular seats, a cup ring disposed in each of the annular seats, reduced peripheral fla formed on the cylinder engaging portion of the cup rings, a relatively wide tin band disposed between the flanges and flush therewith, compression rings mounted within the cup rings and spaced from the sides thereof, said compression rings being formed with vents, means for preventing rosoft metal dispo tation of the compression rings, and means spaced from the cylinder for retaining the compression rings in fixed position.

3. In combination with a cylinder and a floating piston, the piston head. being reduced to form an annular seat, apackirg ring embracing the piston stem and form with llllllllulal seats in inner and (fine; perip ery, a eup Illl sposed in eac o the annular seats, comgresslon rings mounted within the cup rings, said compression rings being provided with vents, means for preventing rotation of the outer compression rings, and means spaced from the cylinder an piston stem for'ret'aining the compression rings infixed position.

4. In combination with a cylinder and a piston, a acking ring embracing the iston stem, sai packing ring. bein form with annular seats on its inner an outer periphery, a cup ring disposed in each of the annular seats, reduced peripheral flanges 'formed on the contact side of the cylinder engaging cup rin a band of a relatively means spaced from the sides of the .cup rings for retaining the same in fixed position.

5. In combination with a cylinder and a piston, a packing ring embracing the iston stem, said packing ring being forme with an annular seat, a cup ring disposed in the annular seat, peripheral flanges formed on the outer shell of the cup ring, a band of relatively soft metal disposed between the flanges and flush therewith, and means spaced from the inner and outer shells of the cup ring and from the cylinder for retainingsaid cup ring in fixed osition.

6. In combination with a cy 'n'der and a floating piston, a packing ring embracing the piston stem, said packing ring being formed with an annular seat, a cup ring dis osed in the annular seat, and means spaced m the inner and outer shells of the on ring and from the cylinder for retaining said cup ring in fixed position.

between the flanges, and

7 The combination with a cylinder, of a movable member carried within the cylinder,

a cup ring embracing the movable member, and means spaced from the shells of the cup ring and the cylinder and carried by the movable member for retaining said cup ring in fixed dposition, said retaining means being provide with vents for ermitting access of a fluid to'the inner shelf 8. The combination with a cylinder, of a movable member carried within'the cylinder, a cup ring embracing the movable member, peripheral flanges formed on one shell of the cup ring, a band of relatively soft metal. disposed between the flanges, and means for retaining the cup ring in fixed position.

9. A substantially U-shaped packing ring having peripheral flanges formed on one of its shells, said flanges reduced in width by cutting away a portion thereof, and a relaflan es reduced in width by cutting away a. tively wide tin band disposed between the portion thereof, and a relatively wide soft flanges and flush therewith. metal band disposed between the flanges and 10 10. A packing ring having an unbroken flush therewith. 5 annular portion forming a friction contact In testimony whereof, I have hereunto surface and being thin enough toflex under afiixed my signature. pressure, said portion having peripheral BRYAN P. JOYCE. 

